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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 23,718,632 | $ 20,478,219 | $ 23,732,858 | $ 20,294,171
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 21,748,247 | $ 18,764,768 | $ 21,740,579 | $ 18,712,533
Weighted Average Interest Rate | 9.39% | 9.03% | 9.44% | 8.93%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 821,138 | $ 898,095 | $ 829,497 | $ 908,846
Weighted Average Interest Rate | 5.01% | 4.51% | 4.98% | 4.38%
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 1,149,247 | $ 815,356 | $ 1,162,782 | $ 672,792
Weighted Average Interest Rate | 12.00% | 10.65% | 11.90% | 10.65%

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